The Sunforce 12 Watt Solar Panel used to be our runaway favorite panel. It still excels in certain applications, but in general we prefer the Goal Zero panels.
Where the Sunforce 12 watt still excels is in the weight per watt category. It is by far the lightest and most compact 12 watt panel we tested. And if you combine it with a cigarette splitter, you can charge two devices quickly.